7:38 a.m.
Adding resources from the JBDS team in case they were interested in trying to help solve
these class loading issues.
Blue Skies,
~Ian
----- Original Message -----
From: "Ian Tewksbury" <itewk(a)redhat.com>
To: "Lincoln Baxter" <lbaxter(a)redhat.com>, "Jess Sightler"
<jsightle(a)redhat.com>, "Pete Muir" <pmuir(a)redhat.com>
Cc: "Windup-dev List" <windup-dev(a)lists.jboss.org>
Sent: Friday, March 27, 2015 8:35:15 AM
Subject: [windup-dev] previously initiated loading for a different type with name
"org/jboss/forge/furnace/util/Predicate"
Lincoln and Jess,
I have spent another evening trying to defeat this class loading error with no luck.
What I have tried:
1. Debugging CompositeFurnaceClassLoader
1. changed #loadClass to #findClass as per ClassLoader suggestion , didn't
help
2. put break point in #findClass to see how many times it is called for
org.jboss.forge.furnace.util.Predicate, it is only being called once, and on that one call
it is failing with the LinkageError, this makes 0 sense to me since the error says that it
has already been loaded
3. Tried various combinations of checking to see if the class has already been
loaded, no luck
4. Tried creating a cache of already loaded classes, didn't help, which makes
sense because the #findClass method (or #loadClass if you dont use my change) only gets
called once for this class.
2.
I have updated the windup-eclipse plugin to use the latest furnace version, 2.15.2.Final,
didn't make a difference 3. I have updated the windup-eclipse plugin to use the
latest Windup 2.2.0 Release, plus my changes to add default constructor to WindupService
and FileService
4. I have stopped using my custom loadType function I was talking about earlier, that
was a red hearing I believe
5. I have spent hours googling this error message with no solution path to be fund
At this point I am totally blocked. I don't know what to try next.
My latest code is here:
plugin - https://github.com/windup/windup-eclipse-plugin/tree/windup2
windup - https://github.com/itewk/windup/tree/windup-eclipse
* as a reminder you can't use SNAPSHOT versions for WINDUP when compiling the windup
eclipse plugin with local changes to Windup because it will always pull the snapshot from
the remote repository and ignore your local changes, unless using releases in which case
maven looks at the local repo first
Has anyone been able to try and reproduce this themselves yet?
Has anyone been able to look over my WindupServices class to make sure I am properly using
Forge/Furnace to access Windup?
I am either doing something really dumb on my end when trying to access Windup or there is
a bug/logic error with the CompositeFurnaceClassLoader.
Blue Skies,
~Ian
!ENTRY org.eclipse.core.jobs 4 2 2015-03-27 08:04:51.234
!MESSAGE An internal error occurred during: "Validating".
!STACK 0
java.lang.LinkageError: loader constraint violation: loader (instance of
org/jboss/tools/forge/core/internal/furnace/CompositeFurnaceClassLoader) previously
initiated loading for a different type with name
"org/jboss/forge/furnace/util/Predicate"
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2615)
at java.lang.Class.getDeclaredMethods(Class.java:1860)
at
org.jboss.forge.furnace.proxy.javassist.util.proxy.SecurityActions.getDeclaredMethods(SecurityActions.java:30)
at
org.jboss.forge.furnace.proxy.javassist.util.proxy.RuntimeSupport.findMethod2(RuntimeSupport.java:134)
at
org.jboss.forge.furnace.proxy.javassist.util.proxy.RuntimeSupport.findMethod(RuntimeSupport.java:65)
at
org.jboss.forge.furnace.proxy.javassist.util.proxy.RuntimeSupport.find2Methods(RuntimeSupport.java:53)
at
org.jboss.windup.exec.configuration.WindupConfiguration_$$_javassist_bdf99157-4ab9-4bb9-a9ec-03565e9d16d6.<clinit>(WindupConfiguration_$$_javassist_bdf99157-4ab9-4bb9-a9ec-03565e9d16d6.java)
at sun.misc.Unsafe.ensureClassInitialized(Native Method)
at
sun.reflect.UnsafeFieldAccessorFactory.newFieldAccessor(UnsafeFieldAccessorFactory.java:43)
at sun.reflect.ReflectionFactory.newFieldAccessor(ReflectionFactory.java:140)
at java.lang.reflect.Field.acquireFieldAccessor(Field.java:1057)
at java.lang.reflect.Field.getFieldAccessor(Field.java:1038)
at java.lang.reflect.Field.set(Field.java:741)
at
org.jboss.forge.furnace.proxy.javassist.util.proxy.ProxyFactory.setField(ProxyFactory.java:525)
at
org.jboss.forge.furnace.proxy.javassist.util.proxy.ProxyFactory.createClass3(ProxyFactory.java:508)
at
org.jboss.forge.furnace.proxy.javassist.util.proxy.ProxyFactory.createClass2(ProxyFactory.java:492)
at
org.jboss.forge.furnace.proxy.javassist.util.proxy.ProxyFactory.createClass1(ProxyFactory.java:428)
at
org.jboss.forge.furnace.proxy.javassist.util.proxy.ProxyFactory.createClass(ProxyFactory.java:400)
at
org.jboss.forge.furnace.proxy.ClassLoaderAdapterCallback$3.call(ClassLoaderAdapterCallback.java:987)
at org.jboss.forge.furnace.util.ClassLoaders.executeIn(ClassLoaders.java:42)
at
org.jboss.forge.furnace.proxy.ClassLoaderAdapterCallback.enhance(ClassLoaderAdapterCallback.java:900)
at
org.jboss.forge.furnace.proxy.ClassLoaderAdapterCallback.enhanceResult(ClassLoaderAdapterCallback.java:253)
at
org.jboss.forge.furnace.proxy.ClassLoaderAdapterCallback.access$200(ClassLoaderAdapterCallback.java:37)
at
org.jboss.forge.furnace.proxy.ClassLoaderAdapterCallback$2.call(ClassLoaderAdapterCallback.java:124)
at org.jboss.forge.furnace.util.ClassLoaders.executeIn(ClassLoaders.java:42)
at
org.jboss.forge.furnace.proxy.ClassLoaderAdapterCallback.invoke(ClassLoaderAdapterCallback.java:96)
at
org.jboss.forge.furnace.services.Imported_$$_javassist_48ac554d-8d60-4d09-8f17-c0a42f2c85b7.get(Imported_$$_javassist_48ac554d-8d60-4d09-8f17-c0a42f2c85b7.java)
at org.jboss.tools.forge.core.furnace.FurnaceService.lookup(FurnaceService.java:96)
at org.jboss.tools.windup.core.WindupService.getServiceFromFurnace(WindupService.java:485)
at org.jboss.tools.windup.core.WindupService.generateGraph(WindupService.java:226)
at org.jboss.tools.windup.core.WindupService.getGraph(WindupService.java:301)
at org.jboss.tools.windup.core.WindupService.getInlineHints(WindupService.java:103)
at
org.jboss.tools.windup.core.internal.validators.WindupValidator.validate(WindupValidator.java:81)
at org.eclipse.wst.validation.Validator$V2.validate(Validator.java:1159)
at org.eclipse.wst.validation.internal.ValManager.validate(ValManager.java:704)
at org.eclipse.wst.validation.internal.ValManager$1.visit(ValManager.java:665)
at org.eclipse.wst.validation.internal.ValManager.accept(ValManager.java:810)
at org.eclipse.wst.validation.internal.ValManager.validate(ValManager.java:669)
at org.eclipse.wst.validation.internal.ValidationRunner.execute(ValidationRunner.java:134)
at org.eclipse.wst.validation.internal.ValidationRunner.validate(ValidationRunner.java:68)
at
org.eclipse.wst.validation.ui.internal.ManualValidationRunner.runInWorkspace(ManualValidationRunner.java:83)
at
org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:38)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
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